Hello,
syzbot found the following crash on:
HEAD commit: f0df5c1b usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=14045831600000
kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5
dashboard link: https://syzkaller.appspot.com/bug?extid=403741a091bf41d4ae79
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c1e62d600000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166a3a95600000
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: [email protected]
usb 1-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor,
different from the interface descriptor's value: 9
usb 1-1: New USB device found, idVendor=0e8f, idProduct=0012, bcdDevice=
0.00
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1: config 0 descriptor??
greenasia 0003:0E8F:0012.0001: unknown main item tag 0x0
greenasia 0003:0E8F:0012.0001: hidraw0: USB HID v0.00 Device [HID
0e8f:0012] on usb-dummy_hcd.0-1/input0
==================================================================
BUG: KASAN: slab-out-of-bounds in set_bit
include/asm-generic/bitops-instrumented.h:28 [inline]
BUG: KASAN: slab-out-of-bounds in gaff_init drivers/hid/hid-gaff.c:97
[inline]
BUG: KASAN: slab-out-of-bounds in ga_probe+0x1fd/0x6f0
drivers/hid/hid-gaff.c:146
Write of size 8 at addr ffff8881d9acafc0 by task kworker/1:1/78
CPU: 1 PID: 78 Comm: kworker/1:1 Not tainted 5.3.0-rc7+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xca/0x13e lib/dump_stack.c:113
print_address_description+0x6a/0x32c mm/kasan/report.c:351
__kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
kasan_report+0xe/0x12 mm/kasan/common.c:618
check_memory_region_inline mm/kasan/generic.c:185 [inline]
check_memory_region+0x128/0x190 mm/kasan/generic.c:192
set_bit include/asm-generic/bitops-instrumented.h:28 [inline]
gaff_init drivers/hid/hid-gaff.c:97 [inline]
ga_probe+0x1fd/0x6f0 drivers/hid/hid-gaff.c:146
hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
really_probe+0x281/0x6d0 drivers/base/dd.c:548
driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
__device_attach_driver+0x
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at [email protected].
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches
On Mon, 16 Sep 2019, syzbot wrote:
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: f0df5c1b usb-fuzzer: main usb gadget fuzzer driver
> git tree: https://github.com/google/kasan.git usb-fuzzer
> console output: https://syzkaller.appspot.com/x/log.txt?x=14045831600000
> kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5
> dashboard link: https://syzkaller.appspot.com/bug?extid=403741a091bf41d4ae79
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c1e62d600000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166a3a95600000
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: [email protected]
>
> usb 1-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor,
> different from the interface descriptor's value: 9
> usb 1-1: New USB device found, idVendor=0e8f, idProduct=0012, bcdDevice=
> 0.00
> usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> usb 1-1: config 0 descriptor??
> greenasia 0003:0E8F:0012.0001: unknown main item tag 0x0
> greenasia 0003:0E8F:0012.0001: hidraw0: USB HID v0.00 Device [HID
> 0e8f:0012] on usb-dummy_hcd.0-1/input0
> ==================================================================
> BUG: KASAN: slab-out-of-bounds in set_bit
> include/asm-generic/bitops-instrumented.h:28 [inline]
> BUG: KASAN: slab-out-of-bounds in gaff_init drivers/hid/hid-gaff.c:97
> [inline]
> BUG: KASAN: slab-out-of-bounds in ga_probe+0x1fd/0x6f0
> drivers/hid/hid-gaff.c:146
> Write of size 8 at addr ffff8881d9acafc0 by task kworker/1:1/78
>
> CPU: 1 PID: 78 Comm: kworker/1:1 Not tainted 5.3.0-rc7+ #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Workqueue: usb_hub_wq hub_event
> Call Trace:
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0xca/0x13e lib/dump_stack.c:113
> print_address_description+0x6a/0x32c mm/kasan/report.c:351
> __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
> kasan_report+0xe/0x12 mm/kasan/common.c:618
> check_memory_region_inline mm/kasan/generic.c:185 [inline]
> check_memory_region+0x128/0x190 mm/kasan/generic.c:192
> set_bit include/asm-generic/bitops-instrumented.h:28 [inline]
> gaff_init drivers/hid/hid-gaff.c:97 [inline]
> ga_probe+0x1fd/0x6f0 drivers/hid/hid-gaff.c:146
> hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
> really_probe+0x281/0x6d0 drivers/base/dd.c:548
> driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
> __device_attach_driver+0x
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at [email protected].
>
> syzbot will keep track of this bug report. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this bug, for details see:
> https://goo.gl/tpsmEJ#testing-patches
The driver assumes that the device contains an input.
Alan Stern
https://github.com/google/kasan.git f0df5c1b
drivers/hid/hid-gaff.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)
Index: usb-devel/drivers/hid/hid-gaff.c
===================================================================
--- usb-devel.orig/drivers/hid/hid-gaff.c
+++ usb-devel/drivers/hid/hid-gaff.c
@@ -64,14 +64,20 @@ static int gaff_init(struct hid_device *
{
struct gaff_device *gaff;
struct hid_report *report;
- struct hid_input *hidinput = list_entry(hid->inputs.next,
- struct hid_input, list);
+ struct hid_input *hidinput;
struct list_head *report_list =
&hid->report_enum[HID_OUTPUT_REPORT].report_list;
struct list_head *report_ptr = report_list;
- struct input_dev *dev = hidinput->input;
+ struct input_dev *dev;
int error;
+ if (list_empty(&hid->inputs)) {
+ hid_err(hid, "no inputs found\n");
+ return -ENODEV;
+ }
+ hidinput = list_entry(hid->inputs.next, struct hid_input, list);
+ dev = hidinput->input;
+
if (list_empty(report_list)) {
hid_err(hid, "no output reports found\n");
return -ENODEV;
On Tue, Sep 17, 2019 at 8:24 PM Alan Stern <[email protected]> wrote:
>
> On Mon, 16 Sep 2019, syzbot wrote:
>
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit: f0df5c1b usb-fuzzer: main usb gadget fuzzer driver
> > git tree: https://github.com/google/kasan.git usb-fuzzer
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14045831600000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5
> > dashboard link: https://syzkaller.appspot.com/bug?extid=403741a091bf41d4ae79
> > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c1e62d600000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166a3a95600000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: [email protected]
> >
> > usb 1-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor,
> > different from the interface descriptor's value: 9
> > usb 1-1: New USB device found, idVendor=0e8f, idProduct=0012, bcdDevice=
> > 0.00
> > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > usb 1-1: config 0 descriptor??
> > greenasia 0003:0E8F:0012.0001: unknown main item tag 0x0
> > greenasia 0003:0E8F:0012.0001: hidraw0: USB HID v0.00 Device [HID
> > 0e8f:0012] on usb-dummy_hcd.0-1/input0
> > ==================================================================
> > BUG: KASAN: slab-out-of-bounds in set_bit
> > include/asm-generic/bitops-instrumented.h:28 [inline]
> > BUG: KASAN: slab-out-of-bounds in gaff_init drivers/hid/hid-gaff.c:97
> > [inline]
> > BUG: KASAN: slab-out-of-bounds in ga_probe+0x1fd/0x6f0
> > drivers/hid/hid-gaff.c:146
> > Write of size 8 at addr ffff8881d9acafc0 by task kworker/1:1/78
> >
> > CPU: 1 PID: 78 Comm: kworker/1:1 Not tainted 5.3.0-rc7+ #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > Google 01/01/2011
> > Workqueue: usb_hub_wq hub_event
> > Call Trace:
> > __dump_stack lib/dump_stack.c:77 [inline]
> > dump_stack+0xca/0x13e lib/dump_stack.c:113
> > print_address_description+0x6a/0x32c mm/kasan/report.c:351
> > __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
> > kasan_report+0xe/0x12 mm/kasan/common.c:618
> > check_memory_region_inline mm/kasan/generic.c:185 [inline]
> > check_memory_region+0x128/0x190 mm/kasan/generic.c:192
> > set_bit include/asm-generic/bitops-instrumented.h:28 [inline]
> > gaff_init drivers/hid/hid-gaff.c:97 [inline]
> > ga_probe+0x1fd/0x6f0 drivers/hid/hid-gaff.c:146
> > hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
> > really_probe+0x281/0x6d0 drivers/base/dd.c:548
> > driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
> > __device_attach_driver+0x
> >
> >
> > ---
> > This bug is generated by a bot. It may contain errors.
> > See https://goo.gl/tpsmEJ for more information about syzbot.
> > syzbot engineers can be reached at [email protected].
> >
> > syzbot will keep track of this bug report. See:
> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> > syzbot can test patches for this bug, for details see:
> > https://goo.gl/tpsmEJ#testing-patches
>
> The driver assumes that the device contains an input.
>
> Alan Stern
>
> https://github.com/google/kasan.git f0df5c1b
You've forgotten "syz test" here :)
#syz test: https://github.com/google/kasan.git f0df5c1b
>
> drivers/hid/hid-gaff.c | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
> Index: usb-devel/drivers/hid/hid-gaff.c
> ===================================================================
> --- usb-devel.orig/drivers/hid/hid-gaff.c
> +++ usb-devel/drivers/hid/hid-gaff.c
> @@ -64,14 +64,20 @@ static int gaff_init(struct hid_device *
> {
> struct gaff_device *gaff;
> struct hid_report *report;
> - struct hid_input *hidinput = list_entry(hid->inputs.next,
> - struct hid_input, list);
> + struct hid_input *hidinput;
> struct list_head *report_list =
> &hid->report_enum[HID_OUTPUT_REPORT].report_list;
> struct list_head *report_ptr = report_list;
> - struct input_dev *dev = hidinput->input;
> + struct input_dev *dev;
> int error;
>
> + if (list_empty(&hid->inputs)) {
> + hid_err(hid, "no inputs found\n");
> + return -ENODEV;
> + }
> + hidinput = list_entry(hid->inputs.next, struct hid_input, list);
> + dev = hidinput->input;
> +
> if (list_empty(report_list)) {
> hid_err(hid, "no output reports found\n");
> return -ENODEV;
>
Hello,
syzbot has tested the proposed patch and the reproducer did not trigger
crash:
Reported-and-tested-by:
[email protected]
Tested on:
commit: f0df5c1b usb-fuzzer: main usb gadget fuzzer driver
git tree: https://github.com/google/kasan.git
kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5
dashboard link: https://syzkaller.appspot.com/bug?extid=403741a091bf41d4ae79
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
patch: https://syzkaller.appspot.com/x/patch.diff?x=131651c9600000
Note: testing is done by a robot and is best-effort only.
On Tue, Sep 17, 2019 at 8:24 PM Alan Stern <[email protected]> wrote:
>
> On Mon, 16 Sep 2019, syzbot wrote:
>
> > Hello,
> >
> > syzbot found the following crash on:
> >
> > HEAD commit: f0df5c1b usb-fuzzer: main usb gadget fuzzer driver
> > git tree: https://github.com/google/kasan.git usb-fuzzer
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14045831600000
> > kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5
> > dashboard link: https://syzkaller.appspot.com/bug?extid=403741a091bf41d4ae79
> > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c1e62d600000
> > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166a3a95600000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: [email protected]
> >
> > usb 1-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor,
> > different from the interface descriptor's value: 9
> > usb 1-1: New USB device found, idVendor=0e8f, idProduct=0012, bcdDevice=
> > 0.00
> > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > usb 1-1: config 0 descriptor??
> > greenasia 0003:0E8F:0012.0001: unknown main item tag 0x0
> > greenasia 0003:0E8F:0012.0001: hidraw0: USB HID v0.00 Device [HID
> > 0e8f:0012] on usb-dummy_hcd.0-1/input0
> > ==================================================================
> > BUG: KASAN: slab-out-of-bounds in set_bit
> > include/asm-generic/bitops-instrumented.h:28 [inline]
> > BUG: KASAN: slab-out-of-bounds in gaff_init drivers/hid/hid-gaff.c:97
> > [inline]
> > BUG: KASAN: slab-out-of-bounds in ga_probe+0x1fd/0x6f0
> > drivers/hid/hid-gaff.c:146
> > Write of size 8 at addr ffff8881d9acafc0 by task kworker/1:1/78
> >
> > CPU: 1 PID: 78 Comm: kworker/1:1 Not tainted 5.3.0-rc7+ #0
> > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > Google 01/01/2011
> > Workqueue: usb_hub_wq hub_event
> > Call Trace:
> > __dump_stack lib/dump_stack.c:77 [inline]
> > dump_stack+0xca/0x13e lib/dump_stack.c:113
> > print_address_description+0x6a/0x32c mm/kasan/report.c:351
> > __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
> > kasan_report+0xe/0x12 mm/kasan/common.c:618
> > check_memory_region_inline mm/kasan/generic.c:185 [inline]
> > check_memory_region+0x128/0x190 mm/kasan/generic.c:192
> > set_bit include/asm-generic/bitops-instrumented.h:28 [inline]
> > gaff_init drivers/hid/hid-gaff.c:97 [inline]
> > ga_probe+0x1fd/0x6f0 drivers/hid/hid-gaff.c:146
> > hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
> > really_probe+0x281/0x6d0 drivers/base/dd.c:548
> > driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
> > __device_attach_driver+0x
> >
> >
> > ---
> > This bug is generated by a bot. It may contain errors.
> > See https://goo.gl/tpsmEJ for more information about syzbot.
> > syzbot engineers can be reached at [email protected].
> >
> > syzbot will keep track of this bug report. See:
> > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> > syzbot can test patches for this bug, for details see:
> > https://goo.gl/tpsmEJ#testing-patches
>
> The driver assumes that the device contains an input.
BTW, these two reports look fairly similar:
https://syzkaller.appspot.com/bug?extid=94e2b9e9c7d1dd332345
https://syzkaller.appspot.com/bug?extid=1e86e2ccce227cca899b
>
> Alan Stern
>
> https://github.com/google/kasan.git f0df5c1b
>
> drivers/hid/hid-gaff.c | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
> Index: usb-devel/drivers/hid/hid-gaff.c
> ===================================================================
> --- usb-devel.orig/drivers/hid/hid-gaff.c
> +++ usb-devel/drivers/hid/hid-gaff.c
> @@ -64,14 +64,20 @@ static int gaff_init(struct hid_device *
> {
> struct gaff_device *gaff;
> struct hid_report *report;
> - struct hid_input *hidinput = list_entry(hid->inputs.next,
> - struct hid_input, list);
> + struct hid_input *hidinput;
> struct list_head *report_list =
> &hid->report_enum[HID_OUTPUT_REPORT].report_list;
> struct list_head *report_ptr = report_list;
> - struct input_dev *dev = hidinput->input;
> + struct input_dev *dev;
> int error;
>
> + if (list_empty(&hid->inputs)) {
> + hid_err(hid, "no inputs found\n");
> + return -ENODEV;
> + }
> + hidinput = list_entry(hid->inputs.next, struct hid_input, list);
> + dev = hidinput->input;
> +
> if (list_empty(report_list)) {
> hid_err(hid, "no output reports found\n");
> return -ENODEV;
>
On Thu, 19 Sep 2019, Andrey Konovalov wrote:
> On Tue, Sep 17, 2019 at 8:24 PM Alan Stern <[email protected]> wrote:
> >
> > On Mon, 16 Sep 2019, syzbot wrote:
> >
> > > Hello,
> > >
> > > syzbot found the following crash on:
> > >
> > > HEAD commit: f0df5c1b usb-fuzzer: main usb gadget fuzzer driver
> > > git tree: https://github.com/google/kasan.git usb-fuzzer
> > > console output: https://syzkaller.appspot.com/x/log.txt?x=14045831600000
> > > kernel config: https://syzkaller.appspot.com/x/.config?x=5c6633fa4ed00be5
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=403741a091bf41d4ae79
> > > compiler: gcc (GCC) 9.0.0 20181231 (experimental)
> > > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c1e62d600000
> > > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=166a3a95600000
> > >
> > > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > > Reported-by: [email protected]
> > >
> > > usb 1-1: config 0 interface 0 altsetting 0 has 1 endpoint descriptor,
> > > different from the interface descriptor's value: 9
> > > usb 1-1: New USB device found, idVendor=0e8f, idProduct=0012, bcdDevice=
> > > 0.00
> > > usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
> > > usb 1-1: config 0 descriptor??
> > > greenasia 0003:0E8F:0012.0001: unknown main item tag 0x0
> > > greenasia 0003:0E8F:0012.0001: hidraw0: USB HID v0.00 Device [HID
> > > 0e8f:0012] on usb-dummy_hcd.0-1/input0
> > > ==================================================================
> > > BUG: KASAN: slab-out-of-bounds in set_bit
> > > include/asm-generic/bitops-instrumented.h:28 [inline]
> > > BUG: KASAN: slab-out-of-bounds in gaff_init drivers/hid/hid-gaff.c:97
> > > [inline]
> > > BUG: KASAN: slab-out-of-bounds in ga_probe+0x1fd/0x6f0
> > > drivers/hid/hid-gaff.c:146
> > > Write of size 8 at addr ffff8881d9acafc0 by task kworker/1:1/78
> > >
> > > CPU: 1 PID: 78 Comm: kworker/1:1 Not tainted 5.3.0-rc7+ #0
> > > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> > > Google 01/01/2011
> > > Workqueue: usb_hub_wq hub_event
> > > Call Trace:
> > > __dump_stack lib/dump_stack.c:77 [inline]
> > > dump_stack+0xca/0x13e lib/dump_stack.c:113
> > > print_address_description+0x6a/0x32c mm/kasan/report.c:351
> > > __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
> > > kasan_report+0xe/0x12 mm/kasan/common.c:618
> > > check_memory_region_inline mm/kasan/generic.c:185 [inline]
> > > check_memory_region+0x128/0x190 mm/kasan/generic.c:192
> > > set_bit include/asm-generic/bitops-instrumented.h:28 [inline]
> > > gaff_init drivers/hid/hid-gaff.c:97 [inline]
> > > ga_probe+0x1fd/0x6f0 drivers/hid/hid-gaff.c:146
> > > hid_device_probe+0x2be/0x3f0 drivers/hid/hid-core.c:2209
> > > really_probe+0x281/0x6d0 drivers/base/dd.c:548
> > > driver_probe_device+0x101/0x1b0 drivers/base/dd.c:721
> > > __device_attach_driver+0x
> > >
> > >
> > > ---
> > > This bug is generated by a bot. It may contain errors.
> > > See https://goo.gl/tpsmEJ for more information about syzbot.
> > > syzbot engineers can be reached at [email protected].
> > >
> > > syzbot will keep track of this bug report. See:
> > > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> > > syzbot can test patches for this bug, for details see:
> > > https://goo.gl/tpsmEJ#testing-patches
> >
> > The driver assumes that the device contains an input.
>
> BTW, these two reports look fairly similar:
>
> https://syzkaller.appspot.com/bug?extid=94e2b9e9c7d1dd332345
> https://syzkaller.appspot.com/bug?extid=1e86e2ccce227cca899b
Indeed they do. I don't have time to patch them now; maybe next week.
Unless you or someone else would like to do it first... :-)
Essentially the same fix should work for each of these -- looks like
they were written using copy-and-paste. In fact, a quick grep through
drivers/hid/*.c shows about 9 of them with the same suspect
initialization code for hidinput.
Alan Stern
> > drivers/hid/hid-gaff.c | 12 +++++++++---
> > 1 file changed, 9 insertions(+), 3 deletions(-)
> >
> > Index: usb-devel/drivers/hid/hid-gaff.c
> > ===================================================================
> > --- usb-devel.orig/drivers/hid/hid-gaff.c
> > +++ usb-devel/drivers/hid/hid-gaff.c
> > @@ -64,14 +64,20 @@ static int gaff_init(struct hid_device *
> > {
> > struct gaff_device *gaff;
> > struct hid_report *report;
> > - struct hid_input *hidinput = list_entry(hid->inputs.next,
> > - struct hid_input, list);
> > + struct hid_input *hidinput;
> > struct list_head *report_list =
> > &hid->report_enum[HID_OUTPUT_REPORT].report_list;
> > struct list_head *report_ptr = report_list;
> > - struct input_dev *dev = hidinput->input;
> > + struct input_dev *dev;
> > int error;
> >
> > + if (list_empty(&hid->inputs)) {
> > + hid_err(hid, "no inputs found\n");
> > + return -ENODEV;
> > + }
> > + hidinput = list_entry(hid->inputs.next, struct hid_input, list);
> > + dev = hidinput->input;
> > +
> > if (list_empty(report_list)) {
> > hid_err(hid, "no output reports found\n");
> > return -ENODEV;